Daniel powers



i tially as follows:

UNITED sTATEs PATENT oEEroE. N

DANIEL POWERS, OF PHILADELPHIA. PENNSYLVANIA;

LOCK.

Specification of Letters Patent No. 23,113, dated March 1, 1859.

To all whom t may concern Be it known that I7 DANIEL PowEns, of the city and county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvementsin Locks for Doors, &c.; and I ldo hereby declare and ascertain said improvements,y referring to the accompanying drawing, in which- Figures 1, 2 and `Sare plans o-f the lock with theV inside plate removed; Fig. 4, `same view with tumblers removed;` Fig. 5, cross section of the lock.

My improvements consist. principally in the expanding and contracting -guards or fence which prevents the feeling out the proper position of the tumblers in attempting to pick the lock, or this expanding and contracting feature may be a part of the tumbler arrangement by reversing the conf struction without at all changing the princi le.

PIhe construction of the lock is subst-anin which the figures shown in the drawing are described;` the same references being used to designate like parts in all the drawings. The case L and bolt I) are made like those of many locks now in use and there is a series of tumblers t to be properly raised by the key as in other tumbler locks. The bolt may be thrown by the revolving bit e, as seen in the drawing or it may be thrown by the bit of the key. I prefer the former arrangement where a se'- ries of loose stops are introduced intothe revolving bit or center as shown at s Fig. 5, as they render the lock more diiiicult t-o pick but I Omit more minute description of this here as I now conne myself to themovable fencebefore named0n the bolt I) I joint two pieces f between which the tumblers must stand when the bolt b is thrown back to unlock it, insteadvof these pieces or fence being permanently affixed to the bolt `as in ordinary `cases they are vmovable so as to have their ends which are toward the tumblers t approach toward or recede from each other. This approach is shown by red lines 1n Fig-` 2, and the expansion in Fig. 3. The two are made to move together by the joint pieces y' which connect them. Now it will be seen that if thetumblers are not properly raised so as to pass between the two bars of the fence they will strike one or the other of them when the bolt starts back and immediately contract them so as to render it impossible for the tumblers to pass until the fence is restored again to place by again carrying the bolt forward. But if the tumblers are so raised they work entirely free between the parts. If this independent movement be connected with the tumblers instead of the vfence theeffect will be the same.

Having thus fully described my improved lock what I claim and desire to secure by Letters Patent is- 1. The independent movable expanding and contracting fence or its equivalent sub-` stantially as above set` forth.

2. I also lclaim the union of the upper and lower halves thereof as herein specified. D. POWERS.

Vitnesses:

JAMES B. SUMMERS,

ROBERT MC CALBER. 

